Last night, T-Mobile and Samsung made an Android 4.0/ICS update available for their Samsung Galaxy S II. This isn't being shipped out automatically through an OTA. Instead you will need to use the Samsung Kies software, plug in your device, then follow the on-screen instructions. Along with Android 4.0 Ice Cream Sandwich, the update also brings CMAS improvements, Wi-Fi calling enhancements, and voicemail enhancements. For a full breakdown on how to get the update through Kies, head over to this link: SAMSUNG.
Sound off in the thread what you thin of ICS on your SGS2.
Source: T-Mobile & Samsung